Adds image retrieval endpoint

src/main/kotlin/net/halfbinary/scavengerhuntapi/controller/AdminController.kt

@@ -0,0 +1,22 @@
+package net.halfbinary.scavengerhuntapi.controller
+
+import io.swagger.v3.oas.annotations.Operation
+import io.swagger.v3.oas.annotations.tags.Tag
+import net.halfbinary.scavengerhuntapi.model.PhotoId
+import org.springframework.security.access.prepost.PreAuthorize
+import org.springframework.web.bind.annotation.PathVariable
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RestController
+@RequestMapping("admin")
+class AdminController {
+    @PreAuthorize("hasRole('ADMIN')")
+    @Tag(name = "Admin")
+    @PostMapping("/admin/photo/{photoId}")
+    @Operation(summary = "Sets a review status for the specified photo")
+    fun reviewPhoto(@PathVariable photoId: PhotoId) {
+        TODO("Set a review status for the specified photo, and update the photo record's status change timestamp")
+    }
+}